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TV: New Flash Supergirl Crossover Promo

Watch new TV spot for upcoming Supergirl / Flash crossover special, “Worlds Finest,” which airs on March 28 on CBS Supergirl 1×18 “Worlds Finest” – Kara gains a new ally when the lightning-fast superhero The Flash (Grant Gustin) suddenly appears from an alternate universe and helps Kara battle Siobhan, aka Silver Banshee, and Livewire in …

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